KBES for Process Control of Nitrification in Activated Sludge Process

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Abstract
Knowledge‐based system technology has recently been introduced in activated sludge plant operations. A knowledge‐based expert system (KBES) called ASPX (Activated Sludge Process Expert) is developed for nitrification process control of a specific petroleum refinery activated sludge plant. This knowledge‐based system has been created to diagnose and correct problems with the nitrification process using rule‐based knowledge (heuristics), statistics, and a predictive mathematical model. The knowledge base consists of rules for each of six process control parameters. For each parameter the process control strategy is executed by the knowledge compiled in logic trees. Database functions such as data entry, statistical evaluation, and the simulation model for effluent ammonia concentration are also included. A user‐friendly interface enables operators who are not familiar with computers to use all of the program functions with little or no difficulty. The goal of the program is to provide an inexperienced operator with the same problem solving capability as that of a senior operator with extensive practical experience.